This Biogas module provides reasonable expectations for investing in on-farm bio-digesters to convert animal waste to process heat and/or electricity. Learn how to calculate the number of animals needed to build a cost effective system.
Link to all of the Northeast Farm Energy IQ Curriculum, developed by Extension specialists from Penn State, Rutgers and University of Vermont.
This is part of the On Farm Energy Production Curriculum Series:
Table of Contents
- Anaerobic Digestion Nutrient Transformations
- Chemical Composition of Digested Effluent
- Liquids-Solids Separation
- Potential for Increased Efficiencies
Anaerobic digestion (AD) is the process in which organic compounds are broken down by naturally occurring bacteria, including methanogenic microorganisms under oxygen free conditions, transforming organic matter into biogas (methane (CH4), carbon dioxide (CO2), water vapor, ammonia, and hydrogen sulfide) (Dugba and Zhang, 1999; AgSTAR, 2010b). The end products of this process include biogas, a renewable …
Anaerobic digestion is a manure treatment system that produces biogas. There are many benefits of digestion such as reductions in: odor, pathogens, and greenhouse gases (climate change). Producing biogas from manure yields useful by-products. The economics of digestion are dependent on state energy policies and co-digestion of off-farm wastes to generate revenue.
Cayuga County Regional Digester (New York)
This virtual tour highlights the Cayuga County Soil & Water Conservation District regional digester. This facility receives …
- Articles and Fact Sheets
- Curriculum and Training Programs
- Multimedia, Conference Proceedings, Misc
- Case Studies
- Anaerobic Digesters and Biogas Safety
- Biogas Utilization and Cleanup
- Economics of Anaerobic Digesters for Processing Animal Manure
- Environmental Benefits of Anaerobic Digestion
- Feedstocks for Biogas
- Introduction to Biogas and Anaerobic Digestion
- Pathogen Reduction in Anaerobic Digestion of Manure
- Processing Biomass Into Biogas
- Types of Anaerobic Digesters
- Transformation and Agronomic Use of Nutrients From Digester Effluent
Anaerobic Digestion of Animal Manures: Understanding the Basic Processes…
When manure is anaerobically digested, the biogas produced is primarily composed of methane and carbon dioxide, with lesser amounts of hydrogen sulfide, ammonia, and other gases. Each of these gases has safety issues. Overall, biogas risks include explosion, asphyxiation, disease, and hydrogen sulfide poisoning.
|Image: US Municipal Supply Company.|
Extreme caution is necessary when working with biogas. Adequate ventilation, appropriate precautions, good work practices, engineering controls, and adequate personal protective equipment will minimize the dangers associated with biogas. Wherever possible, …
Biogas generated from anaerobic digestion processes is a clean and environmentally friendly renewable fuel. But it is important to clean, or upgrade, biogas before using it to increase its heating value and to make it useable in some gas appliances such as engines and boilers.
While most large farms use their biogas for heat and power, it is worthwhile to consider all the options before deciding which path to take, including direct sale of biogas to an …
Anaerobic digestion generates a wide range of byproducts that farmers can use in their farming operations or sell. Beyond biogas used to generate electricity or as fuel, and liquids used for fertilizer or soil amendments, there are solid byproducts, which have a wide range of applications.